The significance of the need for testing when dealing with developed panel shapes in a stitch-and-glue design is that it is the size and layout of the hull panels which determines the three-dimensional shape of the finished hull rather than relying on an internal skeleton which has been carefully plumbed and shaped, and around which planking is laid.
One is built from the outside-in and the other is built from the inside-out.
|This is the very same hull in a photo taken about ten minutes later. The topside panels have been attached with a small number of cable ties and the final shape of the hull has already been defined.|
The fundamental difference between stitch-and-glue and any other sort of construction (with the possible exception of Birch Bark canoe building and some forms of Scandinavian "built by eye" lapstrake (clinker) building) is that it is the shape of the cut hull panels that determine the shape of the assembled hull, rather than the rigid internal skeleton as with a conventional boat.
I'm not saying for one moment that one system is any better than another, but rather I am trying to illustrate why it is so critically important that stitch-and-glue hull panels be absolutely correct in their shape.
|Hull panels for a scale model of Three Brothers showing how different the flat panel shapes are......|
|......compared with when the panels are assembled.|
Now the project is up and running again and here are a few photos: -
|Centreboard case treated with epoxy.|
|Support beams for the stern sheets (aft seat) being treated with epoxy. The inside of the buoyancy compartments have already been treated and thoroughly painted with an epoxy primer/undercoat|
|Floor of outboard motor splash well glued into position, having been thoroughly sealed underneath|
|Aft deck being dry-fitted using silicon bronze screws. It was subsequently glued into position using the screws and additional silicon bronze ring nails|
|Aft seat (stern sheets) glued in after having been epoxy sealed. This view shows how much emergency buoyancy is contained in the sern compartments - this is exactly the same layout as in Phoenix III.|
|Rudder blade halves being marked out. Note how I have drawn the grid at full-size on the plywood.|
|Marking the top of the rudder blade lamination using a compass|
|Using a spline to mark out the gentle curves|
|Using french curves to mark the tight curves|
|Rudder blade halves spread with WEST System Brand epoxy prior to assembly|
|Rudder blade halves glued together over a strongback. Note the good squeeze-out, and just after this photo was taken there were bleed holes drilled in the centre portions|